venable



Feb. 20, '1923.

W. M. VENABLE.

TURNTABLE.v

FILED JULY 11, |922.

4 SHEETS-SHEET 2.

W1 TNESS ATTORNE v5 4 SHEETS-SHEET 3.

Feb. 20, 1928.

. w. M. VENABLE.

TURNTABLE.

, FILED JULY 11, 1922.

WITNESS Feb. 20, 1923. vv. M. VENABLE.

TURNTABLE. FILED JULY 11| 1922. 4 SHEETS-'SHEET 4- WITNESS space, or onsteep grades.

Patented Feb. 20, y192.3.

l *i 1,446,22e

nutren'ermeerATENT OFFICE.

wrnnrnivriu. vNNriBnnor rrrfrennneer., PENNSYLVANIA, AssreNola ToBLAW-'KNOX contraria', e oonroen'rroN or NNWJENSEY.

TRNTABIE. e e e To all whom t may concern.' e, 'y

Be it known that'l, WILLIAM `MAYO VEN- ABLF., a citizen of the UnitedStates, residing at Pittsburgh, in theeounty of Allegheny and State ofPennsylvania, haveinvented certain new and useful limpro'lvekinente` iiiTurntables, 'ot which the following is a speciiicatioii. e

My invention relates to turntables suitable :tor turning road vehicles,and especially use-1 ful Ylfor turning automobile trucks as an in cidentof road construction. rlhe7 invention is particularly 'advantageous lforturning heavily loadedtrucks lin a relatively narrow Hitherto, turningof trucks under such circumstances hasy been accomplished only withdiflioulty inconvenience, at'best; buty with ijny ,'tu'intable, it canbe'jdon'ek quite n readily. y f n ln the construction oii concreteroads, -for instance, it is yusual to prepare-thereubgralde withso-called side rails7 or ori'i'ie either side, and afterward lillinbetween such side railsl withconcrete to 'torni the road. Fortins-*latter purpose, the v concretey is dis;` tributed from a iniirer,which ist shiftet, ahead along 'the eubgiade Ias the work ad-Y vances.rlhe broken,stondeand or other ingredients are delivered tothe mixer bymotor f trucks, which inust generally approach it V around.

over the subgrade, dump their loads, and then return in the directionwhence tney aine. rlhe trucks inust, therefore, be turned As a generalrule, such roads are about 18 'feet in width, inore lOrfless, and itis'tound desirable to employ tive ton trucks for haul-r. ing the roadmaterials. It is practically iinioiisibid lioifever, ttor a tive tontruclrt'o. turn' itself iii/anything like the space between the siderails of such a roadway; andeven it the side rails were removed oroinitted in an "oroiuiate section .ot the prepared roadsuliicient' rooniwouldv `not always be available-to say nothing of ythe difficulty :inddamage incident to having the trucks we l l nach and forth at` the steepsides ot' the subo-rade. In road building on any consid-` erable scaletherefore, it is often desirable to ni-Ovide ay turntable for turningthe truelzs. turntable ehould preferably be `so lo- 1322. Serial No574,129.

iii-St) in tliedirection'whence it canne. ,ln

"order that'the returning truckinay not have to drive over theturntable', it is desirable to place the latter in one side of theroadway, leaving room at the other eide Jfor the truck to pass.

Many trucks, however, are of such wheely base length (diagonally, troinone front f Wheel to the rear'wheel on the other side) that even with aturntable theycannot be turned between side rails 18' feet apartaiot"even, in tact, it' the handicap involved in placing the turntable to oneside of the road as above described did not'exist. Evenwhen the'diagonal wheel-base lengths is aelow as 14 feet, moreover, it isimpossible totbalancejsucli 'a loaded truck "(to perinit ot its being'turned quite easily) on any turntable that can be operated in an 18 tootroadway. For as trucks are ordinarily constructed, some ot' the weightis `carried on the rear wheels (whichv drive), andoiily 30% on the frontwheels .so that in order to balance a'truclt ctie toot wheel-base, therear wheels Should be about -lfeet back t the turning center, and the'trent wheels aboutr 10 feet 'forward troni the center. "To allow thetruck to drive on the tabletroin either 3 end and be properly balanced,then, the turn'- table would have to be over 20 feet long,- which is outof the question. l vIn actual.l practice, turntables hitherto used forroad work have been made only 14: or 15 feet in diameter, in order thatthey may be set and swing within the roadway; and rit has beenimpossible tocenter trucks over the turning center. Then such aturntable can be set level, the additional `:friction entailedbyeccentric loading does not bring the total resistance to turning sohigh'as to be at all prohibitive: but when the table on a grade slopingsonic et or 5% and 'the truck approaches un hill. the best eiiiplace,4

nient on the table that is possible n'illrleeve lthe center of gravityshort ot' the center ot turning, so that in turning the center otgravity inustbe inoved up. hill. A live ton lll() (see especially it isquite beyond the power ot one man if conditions are such that its centerof gravity must be moved up hill as much as 6 inches.`

As a practical matter ot tact, indeed, it 1s found virtually impossibletor even three or tour men to reverse a 5 ton truck on a turntable wherethere is a substantial grade.`

The preferred embodiment of my invention hereinafter described overcomesthese detects and limitations ot turntables hitherto used-making itpossible to balance and turn (full loaded) any commercial tyge I oftruck (if within the capacity el' the table all necessity tor cumbersomeand costly.

stationary ramps such as hitherto employed at the ends oit roadturntables. Y f How these and other advantages can be realized throughmy invention will appear from my description hereinafter ot the best'embodiment or the invention at present known to me.

1n the drawings, Fig. 1 is a somewhat diagrammatic. plan view ot aturntable constructed in accordance with my invention, in place in oneside ot a roadway, and turned to extend lengthwise oit the latter;

Fig. 2 is an elevation at right anglesto Fig. l, showing `the turntableswung across the roadway as in turning a track;

Fig. 3 is a plan view of the turntable a larger scale than Figs. 1 fgrammatic;

Fig. t is a corresponding side elevation;

Fig. 5 shows a longitudinal section through one oi the traclrwaysprovided for the vehicle wheels in the form of; turntable illustrated,'taken as indicated by the line 5 5 in Fig. 3;

Fig. 6 is a plan view ot the rotating and stationary parts of theturntable, minus the traclrways for the vehicle wheels;

Fig. shows a corresponding longitudinal .midsee'tion, taken as indicatedby the line 7-7 in Fig. 6;.

Fig. 8 is a corresponding end. eleva-tion, from the right ot Fig. 6;

on and r2, partly liathrough the movable turntable proper, taken aboutas indicated by the lines 9--9 and Ylll-10 in Fig. but on a largerscale; and

Figs.y 11, 1Q and 153 .are side views of a shittable ramp and support:`4 ed, with its opera-ting mechanism. on one end ot' the rotatabletable-showing the parts in several different positions.

The turntable illustrated in the drawing igs. l. and 2) comprises amounted to turn on va statable structure 3 shoe mounttionary supporting`base 16 that rests on lthe subgrade g. Instead ot being set very v (sayabout a foot above the subgrade) as to clear and swing over the rail rat one side orp the roadway, and the berm, etc., beyoVnd,-or any otherordinary obstructions. The absolute control ot the road width over thegreatest radius oli the table platform being thus transcended, the tableis no longer limited as to overall length. It is perfectly feasible,then, to make the table 2O feet long or more, so as to permit even thevery longest motor truclrs to be properly balanced on it. .and with atruck substantially balanced on the table l5, neither the base structure1G itseliil' nor thev outermost portion of the table structure thatbears on Athe base need be ot very great width in ortering factor. inreference to passage of vehicles in the other side ot the roadway,-narrower than the table 15 itself, in fact. 1t is quite feasible.. also,to place a truck on the table with its center 'of gravity beyond thecenter ot turning, so that the center of gravity shall move down hilland the weight ot lthe truck thus assist the turning.

ln the present instance, yonly the one overhangingend 'li' oftheturntable platiorm elevated so as to clear thc rail 7^, as describedabove. rlllie other overhang-ing` end 1.8 slopes gently downward to apointq'uite close to the ground, so as to serve as a ramp `tor a truckgoing on or ott the table. lit, then, the elevatedv end 17 is made longenough to allow the'longest truck to be balanced on the platform whenfacing toward that end, as shown (say some 12 teet 'from turning centerlto outboard extremity), tlie I `dowmvard sloping ramp end can be madeFigs. 9 `and l() show transverse sections.

materially shorter. as shown (say some S on the table om the.l ramp end;but this han oiliset by the concomitant vadi'antage or" dispensing witha long. heaviv v ramp iforeither end ot' the table. i now, also to Figs.Jl and 5, observed that in the present instance the sloping Lrali'npend'lSo-thetable is well clearof the ground fQs-ayisome 8 oriy 4 inches)at its vextremlity,so .tha-t fthe usual inequalities .of the .'subgradeig awill not interiere with itsimovement 4.at all; `The ramp 18 fissupplemented,Yhowever, with arela ti ,rely shortauxiliary iramporinclinedshoe20 (some 2 ffeet :long or lessi), movablymounted at theextremity oit-the :table endilSso that it can Lbe shifted intocor .outotIgliounden-` raging position, :occasion-may require. `Wheningroundengaging position, this *de vice 2O .supportsithe table lendyL18 1 against tipping underthe unbalanced `weight-oi: a

truck inthe act of mounting or leaving thek table. When the ground issott ratherthan' perfectly hard and ,tirnuastout metal-.plate 21 (Fig.41) `may `be placed in positionfto afford .a iirm bearingforthelrampshoe 20,; and to prevent the ground' lfrom being cut shown,auxiliary` supporting means Lto prel away bythe yshoe'lheel linoperation.

vent overtipping are ralso'fprovided for `the elevated or long table end17,;-1ntlieforirn oft' a,shoe-'.22-mo'vably mounted at the 'eir-ytremity yof thisendd-y sothatit `can vbe shitfted `from ground-engagingpositioninto an elevated 4position Where it will clear thezroad .rail frwithout difiiculty; yThe support afforded the table end 1.7 bythisdevice 22 prevents this end :from tippingldown on the ground inI'casev `a 'mounting trucky is driven materially beyond balancingposition on :the table, `or in case the Wheel ibase length of fthe truckis `so great' that/the liront wheels pass beyond the turningitracks 27,29 before-the real-:Wheels havebegun tol mount the table 4at Lalla,while the ustability of `this device 22 :permits 'the tableto swingfreely with a properlyjba'lance'dtruck.

ln order :to avoid,complications from -inequalities of the ground, theanti-tipping supporting means 120, 22 at opposite endsotthe .tablestructure .'15 may-preferably be made separately operable, ratherthan-provided with common or interconnectedoperating means.

is here shown y 8), the base 16 comprises a :bottom plate or sled 26that rests yon the ground, a jcircular supporting track 27 rigidly.secured to the sled 26, so as to help in Pbracing and stiii'ening thelatter, and a central fhollow boss or stud 28 valso rigidlysecuredftoythe sled 2G, for the purpose oit properly center ing` 'the rotary partswith reierence vto the base. The rotary table structure 1:5has

i n circular track 29 (conveniently ydistinguished as the turning track)for cooperating with the base -track 27, and vis kept properly centeredon thelbase vby meansvot a pivot or kingpin 731 socketedinvthe `hollowboss 28, and engaged in a hub part of the table structure. As shown, the:forward margin ot the 4sled plate 26 is curvedmerely engaged 'upwardsomewhat, ,andaprovided with grabeyes 33 `for .the attachment :of abridle claainr v for )pulling the Whole '.iturntahle forward along lthesubgrade away tromv the mixer) from .time .fto1time, a-sethe workadvances.

s ln order ito minimize the' frietifonal .resistance `to turning' ot therotary table struc# ture `.15, a .mwltiplicity of fanti-friction roll#ers 535 -maybe interposed lbetween the -fbase and; table`ftraoks-27`and29, Aarranged in a circular series.y As shown, these rolilers aremountedron axlefspokesror rods radriv`atingrom a common hub mounted andcentered on av `bearing portion of lthelbase ystud 28, concentric withythe tracks '27 and 29.v :Collars 3S fixed to vrthe spoke-axles or rods36 prevent inward displacement ci the rollers 35;Hand a V'circumj-acenthoop or circularband y40 mounted on the l(nite-r ends-ot therodswprevents outward radfialdisplacement .oit therollers fand spaces`and bfraces the rods As shown, the ends `of the Nrods-36 uare notches 41inthe band '40, so'thattherod's havefsome up and down play, andtherollers 35 `are free for rindependent vertical self-adjustment -tofollow any irregularities oi' the rail` "freely (2i. e., are ne'v'errestrainedby theband" from bearing fully'v on the rail,

even if the latter b'esunfacehentk from a flat ci`r e), though helddefinitely spaced' circumferenti'a-lly.

Nuts 42 on the outer yends of 2the rods 36 hold the band 40 in place andintruefcircular shape?. The rollers 35 may lpreterably beperipherally'rou-nded or cambered some What (but not spherical), asshown, so that 4 they shall not/tend to bind on track or rods,

y and `of lvery hard 4material,.or case-'hardened `members 45 of eachtrackway 44 are interconnected and held in proper lrelathre posidownwardopening tions by channel-like cross bars 47 having at ltheir ends feetriveted or otherwise secured to the lower channel lan'ges (inline withthe turning center at 31), as well as: by ra :trans- Verse channel bar49 extending .and secured i `ac-rossfithe ends of 4all lthe side membersat the outboard extremity oft'theel'evated tuble end 17, and serving as`a stop or bumper to prevent a truck `from accidentally running oit the`table at that yend. y

Besides the ,turning track 29,the struc.g

`ture ior supporting the trackways 44 comprises a rectangular `vtrame"50 overlying and securedto said .track 29, .and also .transrersevmemberssl (including pairs of channels arranged back to back) outsidesaid track 29, connected to and supportedl by saidframe 50. As shown,the trame 50 includes a pair of inward-facing longitudinal channelmembers 52 closely paralleling vthe inner trackway sides L15, and (likethem) resting directly on the base of the inserted rail 29,. and also apair of transverse inward-lacing ,channel members 53 with theirendsresting on the rail `29, abutting and securedto the channels 51.`Sheet metal strips 54 and 55 extend centrally lengthwise and crosswiseof the frame 50, so as to intersecty at its cen-k ter, where thecentering hub-32` is located. At theirends, the strips 54 and 55 aresecured tothe lower iiangesof the channels 52 and 53, and at theirintersection, they are secured together and to the vhub 32 beneath them.The longitudinal frame members 52 overhang beyond the track 29, and inthe spondingly curved plates 57 riveted tast tothebacks ofthe members52. These yokes v56 straddle the pairs ot-channels forming the members52, and their cross'bars 58 (on which the latter rest) are secured tothe yokes by nuts 59.

,In the constructionillustrated, the inner trackwa-y sides` 45 overlieand reston the transverse members 51 and the track 29 be side the frame50, and are secured to the.

frame members 52 by means of bolts 61 (see Fig. 9) extending throughsaid members and the plates 57. The outertrackway sides 45 are securedtothe outer ends of the sup` porting members 51 by means of bolts 62.

In order to permit the turntable ,to be used in a narrow roadway, it maybe found desirable to provide clearance under the outer trackway edgessutlicient to perimt either trackway to overlap a roadrail r somewhati'or most of or even the entire length oir the trackway. As here shown,this is accomplished by making the outer portion ot each transversesupporting member 51 in a rseparate piece 63 (riveted between the outerends ot the channels forming the member), with much of its depth abovethe lower edge Vflanges ot the traclrway sides l5, and with an upturnedloot 6e abutting against the web oit the outer trackivay Amember justabove the lower i'lange oit the latter.

Referring. now, to Figs. 1 to 5 and 11 to 13, it will be observed thateach trackway.

l1 is provided with a separate ramp shoe 20. and that each such rampshoe is moimted to/swing vertically about ai transverse horizontal pivotor pivots 65, mounted in boxnected to said cranks 68 by pivoted links71..

As, shown, these parts y68, 69, 71 arer housed within the brackets 66,at the inner sides of the'channelv members 15. The interconnectedmembers 69 and 71 have cooperatingl abutment or stop shoulders 72, Jforlimiting the motion of the'parts one way to a. position in which thelink pivots are in one straight line with the sha-*ft 67,-or alittlebeyond. The adjacent ends of the two shafts 67 may be providedwithreadily removable operating levers 73, in convenient proximity forconcurrent manipulation by a man standing between them.

Vhen a truck, is to drive on or oil the turntable, the shoes 20 lie flaton the ground as shown in Figs. 3 to 5 and 11, and the toggles formed bythev members 69, 71 are in their straightened position, and perfectlystable against any movement ot the shoes 2O relative to the tablestructure 15. Hence the shoes 2O afford the ramp end 1S of the tablefirm.` and unyielding support againsttipping under the weight of' atruck, besides being themselves unaffected in any way by the truck asthe latter drives overy them to mount the ramp end 18.

Vhen the truck is properly placed on the table and the latter is tobe'swung, the operator raises the levers 7 3 to the point shown in Fig.12, thus lifting the ramp shoes 2O till the links 71 are straight withthe cranks 68.

. Thereupon the operator pulls or pushes the shoes 20 up a littlehigher, past dead center. till downward movement of the levers 73willact to swing them on up into the erect position shown in Fig. 13. Inthis position, the parts are substantially balanced and will not fall.It the shoes 20 are so massive that in order to counterbalance them inthe position of Fig. 12 the levers 73 would have to be inconvenientlyheavy and cumbersome, swinging gravity-actuated pivoted catches 7i suchas shown in Fig. 12 may be provided. to snap under the shoes 2O whenthey reach the position oi Fig. 12 and keep them troni falling.

Thereupon, the operator can swing the turntable as desired (by thelevers 73) utter which he pushes the shoes 2O down again into theposition shown in Fig. 11. ln case the earth is a little high where ashoe 2O strikes it, the operator can finally.v push down on the levers73, and thus exert great pressure to Yforce the shoes down `to finalposition.

Cfr

llO

This description of the operation presup# poses, of course, that thesupporting shoe 22 of the elevated table end 17 is correspondinglymanipulated,-if used at all, As shown in Figs. 3 and 4, the device 22comprises a ground plate attached (at its ends) to the free ends of acouple of lever,v arms 75 fulcrumed at 76 on the adjacent sides of theinner trackway side members verse operating shaft 77 extends clearacross from side to side of the table structure adja ycent the endmember 49, and is'provided with crank arms 78, which are connected bypivoted links7 9 of slightly bent form) with the shoe arms 75. As shown,the intercon! nected members 78v and 79 have'cooperating abutment orstop shoulders`81, corresponding in function to tlievshoulders/ 72 ofthe parts 69 and 7l. Either or both ends of the operating shaft 77(outside the outermost trackway side members 45) may be provided withreadily removable operating .levers 83,-.-similar to the levers 7 3, andhere shown as square socketed to fit the squared ends of the shaft 77.If desired, of course, the table 15 can be swungby one or both of theleversIk 83 as push bars, after the shoe 22has-been released from firm.engagement with the ground. y f

When the parts are in the positions sho-wn in Fig. 4, the toggle7 formedby the membersl 78 and 79 isextendedrpast dead center, and hence kstableand uncollapsible under anysload on the table, so that the device 20affords the table firm, unyieldingsupport against tipping. swung overabout 1800,-till the cranks 78 point upward, and the bends of the links79 strike and rest againstthe shaft 77 ,-4 the shoe 22 is lifted betweenthe trackways 44, where it does not aifectV the yclearance room underthe table .end 18 at all.

illustrated is not only convenient and effective in use, but also easyyand convenient to assemble or take apart quickly, and to transport fromone job to another. For by` sim-` tatable table structure swingable overthe road edge and itself .serving as ramofnr vehicles mounting orleaving it.

2, A roadway turntablecomprising a rotatable table structure swingableover the road edge, and itself serving asramp jfor vehicles mountingit;y and means carried by said table structure for engaging thelgroundto prevent Overtppng of said structure byA A transu ,When the, lever, 83is v a mounting vehicle driven thereupon beyond fb-alancingposition. y

8LA turntable comprising a rotatable table structure swingable over aroad edgevand having its ends of unequal length to accommodate a fullloaded truck of capacity siz balanced y on the table. l 4. A roadwayturntable comprising a rotatable table structure with ends of unequallength to accommodate a full loaded ruck of capacity size balanced onthe `table, theshort end serving as ramp. for ve hiclesv mounting thetable, and the longend swinging over the road edge.L

`5. A roadway turntable comprising a rotatabley table structure withends of unequal length to accommodate a full loaded truck of capacityvsize balanced on the table, the short kend serving yas ramp for vehiclesmounting thetable, and the long end swinging over the road edge and'means carried by saidy long end for engaging the ground and preventingsaid long end from tipping kdown on the ground under the weight of amounting vehicle driven vupon the table structure beyond balancingposition, said means being adjustable to permit the table to swingfreely, Y

6. A roadway turntable comprising a rou tatable table structureswingable over the road edge, land itself serving' as ramp forver'hiclesmounting it, and means comprising a ground shoe 'at one endvof the table structure `for preventing tipping ydown of such end on theground by a vehicle driven on the tablefrom the other end beyondbalancing positiom' and means for elevating such shoe from groundengaging position comprising a lever adapted to serve as a push bar forswinging the table.

7. A turntable comprising. avrotatable tav blekstructure with one endelevated to swing lt will be observed that the turntable herek over aroad edge and of length to accomymodate a full loaded truck of capacitysize balanced on the table facing such end, and the other end slopingdownward as a ramp aid of length to swing within the other road e ge.

8. A lturntablecomprising a rotatable table structure with one endelevated to swing "over a road edge andof length to accommodate a fullloaded truck .of capacity size balanced on the table facing such end,and the other end sloping downward as a ramp and of length to swingwithin the other road edge; `and ymeans carriedby the table ends forengaging the ground to prevent tipping vof the table by'a vehicle` suchmeans being shiftable to permit the table to swing freely.

9, A turntable lcomprising abase adapted to be placed in. one side of aroadway, and l of `such relatively narrow width as not to interfere withpassage of vehicles in the other side ofthe roadwaygand ar rotatabletable structure supported by said vbaseA toswing over the road edge,itself serving as ramp tor lvehicles mounting ,or leaving it 'and oflength to accommodate la tull loaded truck balanced thereon so as not totip the table structure even when the latter 'is turned crosswise of theroadway.

10. A turntable comprising a base adapted. to bel placed ,in one` sideot ya roadway; and a rotatable ytable structure on said base leavingroom for passage o`t vehicles inthe .other side of the roadway whenturned to extend lengthwise .of ,the latter, and having one end elevatedto swing over aroad 'edge and ot-length greater 'than the other toaccommodate va full 'loaded truck of capacity `,size balancedonthef'table facing such lend.

1l. A turntable colrlprisingabae adapted .tobe placed in one side `of jaroadway and a rotatable tablestrncture `on saidbaseleavroom for 'passageof vehicles in [the 4other side ,of the Vroadway vwhen turned toeiitendlengthwise ot the latter, one end of said structure being`elevated to swing over a road ,edge and of'leng't to Vaccominodate afull loaded trll'kof capacity size -`balanced 101,1 the 'table tacingsuch end, and y,the Iother end sloping downward as a ramp and'being oflength to swing ,within -the other road edge.

12. A Iturntable for road vehicles com-A prising a'turning track;supporting structure overlying saidftrack and Aoverhanging therefrom,including transverse supporting members `outside the track; a:stationary base with supporting means for said turning tracl;over-hanging'trac-kwavs `for the vehicle wheels overlying and supportedby said transverse nienifbe-rs beside 'the portion of said supportingvstru'iture overlying the track, sloping downward `as rampsat one end,and at the etheriele'va-.ted to swing `over a road edge and ,of lengthto accommodate a full loaded truck .ot capacity size balanced :thereonfacing such end.

13. A turntable 'tor road vehicles couiprisiug a statioi-lary hase )withsupporting track; a rotatable table structure with turningtrack; and acirc-uni' series .ot peripherally rounded anti-friction rollersinterposed between said tracks. held .definitely spaced apart.circumferentiallv, but `Free tor independent vertical sell to ,oneanother.

14;. `A tinntable for road vehicles comljustment relatively .prising a.station ry'base with supporting tracka rotatabletable structure withturning track; and an anti-friction roller ,assenr blycomprising-spoke-aXles, a circular series ot rollers interposed betweenyid tracks, and a notchedbaiulengaging said 4axles and spacing 'themapart circumfere'ntially while permitting 'them independent `freedom ofvertical `self-adj,itstment, ,and 1also preventing radial displacement`of lthe rollers.

"15. Amturnlblewfo'r 'road 'vehicles commovement of the ramp means whenthe lat ter is in ground engaging position.

.17. A roadway turntable comprising a sled base, a supporting structurerotatable on said base; and trackways for the vehicle wheels resting onsaid supporting structure, swingable, by its rotation, over a road edge,and themselves serving as ramps for vehicles mounting or'lyeaving theturntable.

18. A roadway turntable comprising a base, a supporting frame rotatableon said base and trackways for the vehicle wheels beside said frame,with supporting means for said trackways carried by said frame andextending from either side thereof beneath the trackways.

l19. A revolving turntable for road vehicles comprising trackways 'forthe .vehicle wheels, transverseA supporting` members eX- tending beneathsaid trac-kways, aturning Atrack between said members, and structureoverlying said ,track connected thereto and tosaid members fortransmitting the load of the trackways from the latter to the former.

20. A revolving turntable tor road vehicles comprising a revolvingturning track, a supporting Aframe structure mounted on and overlyingsaid track, and separate trackways for the vehicle wheels detachablysecured beside said 'trame structure at either sideA thereof.

21. A roadway turntable con'iprising a re'- volving .turning track, a'trame structure mounted on and overlying said turning track, andtrackways for the vehicle wheels resting on said turning` track besidesaid frame structure.

22. A revolving turntable tor road vehicles comprising trackways for thevehicle wheels` a turning track a supporting frame overlying said track`and transverse supporting members for said trackways subjavcent the sameand said trame supported b v the latter.

23. A revolving turntable for road vehicles comprising a turning track;a support ing iframe structure mounted on and overlying said track, withtransverse `supportingmembers extending to either side there from; ,andA'separate trackways for the vehicle wheels'atfeither side of said framestructure, with 'inner lateral strength'members resting on saidtransverse supporting members, and outer side members secured to theends of said transverse members. f

24C. A revolving turntable for road vehi- Cles comprising trackways forthe vehicle Wheels, with inner and outerlateral strength members;transverse supporting members for the trackvvays secured` to saidstrength members; a turning track between said transverse members; and aframe mounted on and overlying said track, with members overhanging andsupporting said transverse members. s f

In testimony whereof, I have hereunto signed my name.

WILLIAM M. vENABLn.

